Could you explain the differences between HTTP GET and POST methods?

HTTP GET and POST methods differ in purpose and data transmission method:

• GET is used to retrieve data from the server. GET requests pass parameters in the URL (e.g., ?id=123). They are considered safe and idempotent, meaning they should not change the server's state.

• POST is used to send data to the server, for example, when creating a new record. Data is sent in the request body, allowing for larger volumes and more complex structures.

Example in C# (ASP.NET Core):

[HttpGet("items/{id}")]
public IActionResult GetItem(int id) {
    // Retrieve item by id
}

[HttpPost("items")]
public IActionResult CreateItem([FromBody] Item item) {
    // Create a new item
}

Thus, GET is for reading, POST is for creating or modifying data.